Electric Starfish

On the distant planet of Thule water must be conserved and you must control the constructor robots to build the resevoirs. The only problem is that the native predator of Thule, a kind of giant starfish, is deadly and will stop you if it can. Can you store enough water to ensure that Thule survives? A Qix style game by Murvyn Pikestriker, however there have been unsubstantiated claims that it was an unauthorized rip off of a Tom Hudson game called Fill'er up!.